Touch Display Shield Electrode Layout for Panel Noise Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices suffer from noise interference between the display panel and touch panel, with existing shield layers being ineffective in blocking noise from the display panel to the touch panel.
Innovation Solution
Incorporation of a shield electrode between the first electrode and the touch/ recognition panel, applied with a shield-electrode signal to reduce noise interference, utilizing replicated signals of the driving or recognition signals for synchronization and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield layer is provided between the display panel and touch panel, then noise blocking function is improved, but the shield layer cannot sufficiently exert its noise blocking function when in ground connection
Solution Approach 1:
The patent changes the electrical potential parameter of the shield electrode from ground connection (0V) to a floating state with adjustable potential. By controlling the potential of the shield electrode to match the potential of the first electrode, the patent creates an equipotential region that effectively blocks noise from the display panel to the touch panel, resolving the inadequacy of ground-connected shield layers.
Solution Approach 2:
The patent applies the equipotentiality principle by making the shield electrode have the same potential as the first electrode through controlled potential application. This creates an equipotential shield that prevents electric field penetration and noise transmission from the display panel to the touch panel, significantly improving noise blocking effectiveness compared to ground-connected shields.
2Device complexity
If the touch panel is disposed directly over the display panel, then device structure is simplified, but the touch panel receives large noise from the OLEDs
Solution Approach 1:
The patent introduces a shield electrode as an intermediary layer between the first electrode of the display panel and the touch panel. This intermediate element serves as a noise barrier that intercepts and blocks electromagnetic noise from reaching the touch panel, while maintaining the overall compact structure of the device.
Solution Approach 2:
The patent applies local quality by providing noise shielding only in the specific region where noise interference occurs (between the first electrode and touch panel), rather than shielding the entire device. The shield electrode is strategically positioned and potential-controlled to provide localized noise protection while minimizing additional complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively blocks noise from the display panel to the touch/ recognition panel, enhancing the operational performance of the display device.
Implementation Method 1
a shield electrode formed between the first electrode and the touch panel to be applied with a shield-electrode signal
Implementation Method 2
a second touch electrode that is driven by a driving signal for detecting the touch in response to a change in mutual capacitance between the first touch electrode and the second touch electrode
Implementation Method 3
a light-emitting layer that emits light to display the image
Data Source
AI summary
A display device includes a display panel and a touch panel, wherein the display panel has a light-emitting layer, a first electrode, and a second electrode, the touch panel has a first touch electrode, and a second touch electrode that is driven by a driving signal for detecting a touch in response to a change in mutual capacitance between the first touch electrode and second touch electrode, and the display device further includes a shield electrode formed between the first electrode and touch panel to be applied with a shield-electrode signal.